I just remembered they run this challenge every year for the playoffs. I didn't see any other post about this so I took it upon myself to create a POD league for the purpose of this challenge. It's aptly named PrideOfDetroit.com
To get started in the game itself go to http://www.nfl.com/fantasy sign in or create an account You can then make your picks. Keep in mind you get a multiplier of score for carrying a player over to the next week, so keep that in mind when making your selections.
To find the league itself go to http://challengegames.nfl.com/playoffchallenge/leagues/31040 after you've signed up and gotten your picks made.
It's worth doing this for fun alone. The bonus is if you manage to get the highest score of everyone (not just our little league) you can win a trip to the super bowl next year! So what are you waiting for? Get on it!